Car-door mechanism.



c. A. LINDSTRM.

OAR -DOOR MEGHANISM. APPLICATION FILED AUG. 2a, 1908.

Patented Apry, 1909.

G. A. LINDSTRM.

GAR DOOR lISIIECHANISM. APPLIUATION FILED AUG. 2a. 190s.

Patented Apr. 6,1909. 2 sHBE'Ts-snsw 2.

Wim @son M @fym/ atteint earner rerun.

CHARLES. A. LINDSTRM, OF PITTSBURG, PEX' SYLYAXIA, ASSIGNOR TO PRESSEDSTEEL CAR COMPANY, OF PITTSBURG, PEXXSYLVAXIA, A CORPORATION OF NEWJERSEY.

- which the following is a description.

C-DOOR REGHANISm.

Patented April e, i909.

Application filed August 28, 19th?.y Serial N0. 450,611.

i suitable means at its ends or elsewhere toro- T o all 'whom it mayconcern:

Be it known that l, CHARLES A.' LrND- t 1 ings, is provided with a au'of chain windingf STRM, residing at Pittsburg, north side, county 4ofAllegheny and State of Pennsylvania, have invented certain new anduseful Improvements in Car-Door Mechanism, of full, clear, and exact Allobject of the present invention is .to provide improvements in thatclass of door sheaves tate same. Shaft 5, as shown in the-dra w- 6provided Wit acentral perforation 6a to receive the shaft 5, andperforations 6b to receive a pin for securing the sheave 6 to the shaft-5` and for securing the g chain to the sheave and shaft and a spirallguideway 6c extending substantially the ena rotatable shaft anddoordiftin'g' chain are .Winding about theshaft is employed for rais-lemployed.

to provide a specific form of `winding sheave the door.

A further specic object of the present in i vention is to provide animproved arrange-A ment ofthe chains relatively to the doors and thewinding shafts Where a plurality of chains ing the door. A furtherobject of the present invention is to provide an improved yieldingconnection for'the chain to compensate forstretching and Wear of thelinks and take up shock due to opening the door, and further to providea'yield in the chain in the event of its door becoming jammed fromlading or other causes.

The invention is clearly illustrated in the accom anying drawings inwhich like'reference 'c aracters refer to like parts, and in which:

Figure 1 is a plan view of a ortion of a car sufficient to illustratethe su ject-matter of my invention; Fig. 2 is a sectional side elevationof a Fi .1 on t e line 2 2, Fig. 1; Fig. 3 is a de- I ta' longitudinalsectional view of a ortion f the structure shown in Fig. 1 on t e line3-3, Fig. l; Fig. 4 is a detail view of one of the devices Lcomprised inmy invention; Fig. 5 is' an end elevation of the same; Figs. 6, 7 and 8are three different views of another device comprised in my invention.

Referring now in detail to the drawings, l represents a carcross-bearer, 2 a suitably hinged drop door, 3 an elongated slot in thecross-bearer 1, 4 a slotted casting providing a. widened "bearing forthe shaft 5 which is adapted to move bodily through slot 3 and casting4. Shaft 5 is operated through any ortion of the structure shown in y.for said chain which also forms a door-sup- `porting connection betweenthe lifting shaft i l 5. At the end of the she'ave 6 oppositeL the thedoor 2.

, ma'ming doors.

. tire length of sheave 6 up to a serrated ,roller operating mechanismfor dump cars inwhich '7. 6d.

As mountedon the shaft 5, a pair of sheaves 6 for each drop door 2 arearranged with theiry serrated rollers 6d facing each other and withtheir spiral guideways 6c eX- tending toward the side edgesof the door.

7 is a chain secured at one end to 8 passed through perforationsb andthe shaftserrated rollersd the opposite 'end of the chain 7 is connectedto the door 2 by an eyebolt 9 passed through a perforation l()a in ashoe bracket 10 riveted to the underside of y Bracket 10 is formed witha serrated inclined raised portion or shoel 10b so formed on the bracket1() as to be inline with the serrated roller 6d of the sheave 6. Whenthe bracket `10 and the sheave 6 are secured in position theintermediate por-tion of each chain 7 is wound about the spiral guideway6c of its respective -sheave 6.

11 are springs mounted on eye-bolts 9 between theA rear sides ofbrackets 10 and washers 12 on eye-bolts 9. The object of springs 11 isto provide against stretching of chains 7 by allowing the remainingchains 7 to give suiiiciently to insure Winding of a stretched chain orchains 7 on the lshaft 5. Springs 11 also permit of -further Winding ofshaft 5 when one or more of the doorsbecomes obstructed by lading, toclose the re- Again, springs 11 cushion chains 7 against injuriousjars'or jolting due to sudden dropping of the doors upon dis. charge ofthe lading.

Assuming the parts to be in positions shown in the Figs. 1, 2 and 3, theshaft 5 is rotated in the direction of the arrow", Fig. 2, and is causedto lmove from beneath the door 2 by the action of the serrated roller 6d on the shoe 10", the bottom of the shaft 5 sliding relatively to thelower edge of the slot 3. As this translation of the shaft 5 takes placethe chain 7 is unwinding from the spiral guide- Way 6c toward-the end ofthe sheave 6 and the cross-bearer 1, and this unwindng con- I tinues asthe doors drop after the ,shaft` 5 has facing each other and towardthecen'ter of the free edge of been moved from .beneath thenafI It willthus be seen that the major portion of the t chain 7 vis fed from aposition toward the centhe' door gives support to the v door wherejmostneeded, when in closed pcbinedvchain guide and sition, While theanchorage of the chain to the door at the 'peint indicated in thedrawings gives support to the deer where most needed during its descent.lhe spring or cushioning connection between the door and shaft may belocated at any place between said devices.

Having thus described my invention, the following is what I claim as newtherein and desireto secure by Letters Patent A. 1.V In a dump car, thecombination with' a drop door and a door-raising shaft, of aconrdoor-engaging y roller mounted en said shaft, a pin passedtransversely through said roller and shaft and a cable secured atene-,end to the door and at its opposite end to said pin. u

2.l In a dump car, the combination With a drop door and a bodilymovableA shaft for raising said door, of a combined Wearing shoe andcable anchor rigidly mounted on. the underside ofsaid door, a combineddoor-engaging roller and chain guideunounted shaft, an eye-bolt passedthrough said roller to as great an extent as' on said.

tubular door-'engaging roller formed With a cable-engaging guide andhaving 'a transverse perforation, a transverse perforationin the shaftregistering with the perforation in said roller and a pin passingthroughsaid roller and said shaft site end of said cable.

4. In a dump car, in combination With a drop door and a winding device,a Icable connected at one end to said Winding device and a spring'interposed between said door and cable andlocated beneath said door..

In a dump car, in combination with a drop door andra Winding device, abracket located on-the underside of said doel-,a cable connected at oneend to said winding device and secured to the oppoand a spring mountedon said bracket beneath the door and interposed betyveen said cable anddoor.

6. In a dumpI car, the combination of a drop door and4 door-raisinglshaft, a chain guide mounted on said shaft, apin passed transverselythrou cable adapted to Wind on said guide and connected to said door.

The foregoing specification signed at Mc- Kees Rocks, Allegheny county,Pennsylvania, this V13th day of August, .1908."

' CHARLES A. LINDSTROM.

Witnesses: G. A. SCKFIELD,

B. FISHER.

h said chain guide and -a

